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Unfortunately, no will and no probate.. (I am not sure if there is a time limitation for probate)
So the pursuit of this case would probably need to go to a judge for assessment of whether my mother was under duress..? I believe that my brother and Dad did attempt to go to see my mother while she was staying with my sister, and my sister and brother -in-law called the police (!) on them...
Pursuing this case would need to go through a lot of historical detail